Lock.



PATENTED DEG. 15,1903.

H. R. ANTGLIP J LOOK.

APPLICATION FILED MAY 4 1903.

N0 MODEL.

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UNITED STATES Patented December 15, 1903.

PATENT OFFICE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 746,774, dated December15, 1903.

Applicationfiled May 4, 1903. Serial No. 155,655. (No model.)

To all whom it may concern:

Be it known that I, HARRY RICHARD ANT- CLIFF, a subject of the King ofGreat Britain, residingat Birmingham,in the county ofWarwick,England,have invented certain new and useful Improvements in Locks, of which thefollowing is a specification. Y

This invention relates to locks.

The object of the invention is in a ready, simple, thoroughly feasible,and practical manner to render a lock non-pickable, the improvementbeing of such a character as to obviate any marked change in thestructural arrangement of the lock, thereby reducing the cost ofapplication of the improvement to a f minimum and permitting it to beapplied to looks already in use.

With these and other objects in view, as

will appear as the nature of the invention is better understood, thesame consists, generally stated, in making the keyhole an allthroughsolid-walled tubular passage-sepa rate from the mechanism of thelock andhaving a plurality of keyways arranged at the back of the lock to permitthe keyto be pulled back into and operate the wards or levers by turningthe key in the usual manner. The keyways, which in this instance areshown as two in. number in addition to the keyhole proper orentrance-keyway, are cut in the back plate of the lock in the form ofslots, radiating at any convenient angle from each other, the saidkeyways being normally closed or protected by a curtain or disk operatedand carried around by the key in a manner hereinafter described, so thatwhen the key is manipulated to release the wards of the lock thesupplemental keyways are sealed.

In the accompanying drawings, forming a part of this specification, andin which like characters of reference indicate correspond-v ing parts,there is illustrated one form of embodiment of the invention capable ofcarry ing the same into practical operation, it being understood thatthe elements therein exhibited may be varied or changed as to shape,proportion,and exact manner of assemblage without departing from thespirit thereof.

In the drawings, Figure 1 is a view in perspective of a lock embodyingthe improvements hereinafter described, the view being taken from thefront of the lock. Fig. 2 is a similar view taken from the rear side ofthe lock. Fig. 3 is a view in vertical section taken on the line a; a ofFig. 1. Fig. 4 is a vertical section taken on the same line as Fig. 3,exhibiting the key in its operative and inoperative positions. Fig. 5 isa compound view exhibiting in front and edge elevation the disk orcurtain constituting the gist of the present invention.

Referring to the drawings, a designates the lock, which may be of anypreferred construction and is provided with a solid-walled tubularkeyhole or entrance-passage b, a continuation of which is formed by ahollow boss formed a keyway to the back plate a of the lock. Cut in thesaid back plate and leading from and forming a connection with the exitend of the keyhole b are two radially-disposed slots (1 and d, disposedat convenient angles to each other and constituting keyways or openingsfor the key 2. The keyways d and d are normally covered or sealed by theflange f of the curtain, which in this instance is shown as a disk,which flange bears against the inner face of the back plate 0, thecurtain being held against displacement by coaction between the flangeand the back plate and the boss f and the rear wall of the tubularpassage 1). The key 2 is provided with a collar 6, adapted to engageagainst the front plate 9 ot the lock to limit its inward insertion; butit will be obvious that, if preferred, the said collar may be omittedwithout departing from the scope of the invention.

In operation to lock the lock the key is inserted through the keyhole band through the curtain andvis turned, together with the curtain, untilthe key comes opposite the opening (Z, whereupon it is partiallywithdrawn to permit the wards of the key properly to engage the tumblersof the look, as indicated by dotted lines in Fig. 4. Upon the key beingturned its wards actuate the tumblers, and when the tumblers arereleased the wards of'the key are then opposite the keyway d, whereuponthe key is pushed inward to free the wards from the back plate o andupon giving the key a further turn its wards are brought opposite thekeyholeb, whereupon the key may be withdrawn. To unlock the lock the keyis again inserted and turned in of the curtain or disk f, through whichis the opposite direction, being pulled back into the keyway d, andafter releasing the tumblers it is pushed out through the keyway cl andafter being turned in the manner described is withdrawn through thekeyhole b. As there is only one keyway or opening in the curtain ordisk, it follows that only one opening or keyway can be disclosed in theback plate of the look at one time, and this renders the lock safe inuse and practically non-pickable.

It will be seen from the foregoing that by providing a solid-walledtubular passage for a keyhole and by operating the lock from its back itis impossible to obtain direct access to the mechanism of the lookthrough the keyhole in the usual manner, so that tampering with a lockconstructed in accordance with the present invention will be practicallyimpossible.

Having thus described the invention, what I claim is 1. A look providedwith a solid-walled tuways or openings cut in its back plate, and acurtain or disk provided with a single key way, and operated by the key,the keyways being so disposed as to communicate with the keyhole topermit the key to operate the locking mechanism.

2. A look provided with an all-through solid-walled keyhole or passage,and with a plurality of keyways in its back plate radiating from thekeyhole, and a curtain or disk movable by the key for protecting thekeyways. 7

3. A lock provided with an all-through solid-walled keyhole or passage,and with a plurality of keyways in its back plate radiating from thekeyhole, and a curtain or disk movable by the key for protecting thekeyways, and having a single keyway.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HARRY RICHARD ANTGLIFF.

Witnesses FRANK BIDDLE,- ALBERT NEWEY.

